class Student():
    def __init__(self, kokugo, sansu):
        self.kokugo = kokugo
        self.sansu = sansu
 
 
class Students():
    def __init__(self):
        self.students = []
 
    def append(self, student):
        self.students.append(student)
 
    def show_total(self):
        kokugo = 0
        sansu = 0
        for student in self.students:
            kokugo += student.kokugo
            sansu += student.sansu
        print("kokugo total:", kokugo)
        print("sansu total:", sansu)
 
 
if __name__ == "__main__":
    a = Student(kokugo=70, sansu=80)
    b = Student(kokugo=30, sansu=40)
    students = Students()
    students.append(a)
    students.append(b)
    students.show_total()
 

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